When a call comes in, the three people on shift at this small office just outside Portsmouth, on Britain's south coast, suddenly become central to the current conflict in the Middle East.

Since Iran effectively closed the Strait of Hormuz in response to US-Israeli strikes, the number of emergency calls a tiny British office receives has skyrocketed.

When a call comes in, the three people on shift at this small office just outside Portsmouth, on Britain's south coast, suddenly become central to the current conflict in the…